LSI0128HG003A | 1.28 inch TFT-LCD | 240x240 | 16-bit 8080 | GC9A01A
1. Executive Summary & Product Positioning
The LSI0128HG003A is a 1.28-inch transmissive type a-Si TFT-LCD (amorphous silicon thin film transistor liquid crystal display) module developed by 立信(万安)智显科技有限公司 (Lesson Smart Display Technology Co., Ltd). It is composed of a TFT-LCD panel, a driver circuit, and a backlight unit. The panel size is 1.28 inch and the resolution is 240(RGB)*240, the panel can display up to 262k colors.
Product Positioning: Designed for applications requiring a compact, circular-shaped display with a fast parallel interface and excellent viewing angles. With its IPS (Free) viewing direction, 16-bit 8080 parallel interface, and integrated GC9A01A driver IC, it is ideally suited for smart wearables, compact handheld devices, smart home controls, and other embedded systems that need high-speed data transfer and superior image quality from a small display.
2. Detailed Product Overview & Architecture
The module's architecture is designed for high performance and straightforward integration. The primary components include:
- TFT-LCD Panel: 1.28-inch diagonal, a-Si TFT active matrix, transmissive, IPS (Free) display mode. The resolution is 240(RGB) × 240 pixels with a circular active area of Φ 32.4 mm.
- Driver IC: The module uses the GC9A01A driver IC, which supports the 16-bit 8080 interface.
- Backlight Unit (B/L): A white LED edge-lit backlight unit. The typical forward current (If) is 40mA with a forward voltage (Vf) of 3.0V to 3.4V.
- Mechanical Construction: COG (Chip-on-Glass) + FPC + B/L. The module outline dimensions are 35.2(H) × 37.24(V) × 0.5(T) mm (PI+FPC thickness 0.2±0.03mm).
- Interface: The module communicates via a 31-pin connector. The main display interface is a 16-bit 8080 parallel interface.
3. Exhaustive Technical Specifications
3.1 General & Mechanical Specifications
| Item | Specification |
| Display Size (Diagonal) | 1.28 inches |
| Resolution (Dots) | 240(RGB) × 240 |
| Display Technology | a-Si TFT, Transmissive, Active Matrix |
| Display Format | Graphic 240(RGB)×240 Dot-matrix |
| Module Construction | COG+FPC+B/L |
| Color Depth | 262K Colors |
| Viewing Direction (Grayscale Inversion) | Free (IPS) |
| Input Data Interface | 16-bit 8080 Interface |
| Active Area | Φ 32.4 mm (Circular) |
| Module Outline (H×V×D) | 35.2 × 37.24 × 0.5 mm |
| Driver IC | GC9A01A |
| Operating Temperature | -10°C to +60°C |
| Storage Temperature | -20°C to +70°C |
3.2 Electrical Specifications
3.2.1 Absolute Maximum Ratings
| Parameter | Symbol | Min | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | VCC | -0.3 | 4.6 | V |
| Supply Voltage (IO) | IOVCC | -0.3 | 4.6 | V |
| Operating Temperature | TOPR | -10 | 60 | °C |
| Storage Temperature | TSTR | -20 | 70 | °C |
3.2.2 DC Characteristics (Ta=25°C)
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | 2.5 | 2.8 | 3.3 | V |
| Supply Voltage (IO) | IOVCC | 1.65 | 2.8 | 3.3 | V |
| Input Voltage (Low Level) | VIL | 0 | - | 0.3*IOVCC | V |
| Input Voltage (High Level) | VIH | 0.7*IOVCC | - | IOVCC | V |
3.2.3 16-bit 8080 Interface Timing Characteristics (Write Cycle)
The module supports both 8080-I and 8080-II interface timings. Key parameters for the Write Cycle include:
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Write Cycle | twc | 66 | - | - | ns |
| Write Control Pulse H duration | twrh | 15 | - | - | ns |
| Write Control Pulse L duration | twrl | 15 | - | - | ns |
| Write Data Setup Time | tdst | 10 | - | - | ns |
| Write Data Hold Time | tdht | 10 | - | - | ns |
| Chip Select Setup Time (Write) | tcs | 15 | - | - | ns |
3.3 Interface Pin Map (31-Pin Connector)
The module uses a 31-pin connector. The pinout integrates the 16-bit 8080 parallel interface, power supply, and backlight signals.
| Pin No. | Symbol | I/O | Description |
|---|---|---|---|
| 1 | VCI | P | Power Supply |
| 2 | VDD | P | Power Supply |
| 3 | GND | P | Ground |
| 4 | DB15 | I/O | Bi-directional Data Bus (MSB) |
| 5 | DB14 | I/O | Bi-directional Data Bus |
| 6 | DB13 | I/O | Bi-directional Data Bus |
| 7 | DB12 | I/O | Bi-directional Data Bus |
| 8 | DB11 | I/O | Bi-directional Data Bus |
| 9 | DB10 | I/O | Bi-directional Data Bus |
| 10 | DB9 | I/O | Bi-directional Data Bus |
| 11 | DB8 | I/O | Bi-directional Data Bus |
| 12 | DB7 | I/O | Bi-directional Data Bus |
| 13 | DB6 | I/O | Bi-directional Data Bus |
| 14 | DB5 | I/O | Bi-directional Data Bus |
| 15 | DB4 | I/O | Bi-directional Data Bus |
| 16 | DB3 | I/O | Bi-directional Data Bus |
| 17 | DB2 | I/O | Bi-directional Data Bus |
| 18 | DB1 | I/O | Bi-directional Data Bus |
| 19 | DB0 | I/O | Bi-directional Data Bus (LSB) |
| 20 | SDA | I | Serial In/Out Signal |
| 21 | GND | P | Ground |
| 22 | RD | I | Read Signal (MCU reads data at rising edge) |
| 23 | WR | I | Write Signal (MCU writes data at rising edge) |
| 24 | RS | I | Data/Command Select (DCX) |
| 25 | CS | I | Chip Select Input (Low Active) |
| 26 | RES | I | Chip Reset Signal (Low Active) |
| 27 | IMO | I | Interface Mode Select |
| 28 | IM1 | I | Interface Mode Select |
| 29 | IM2 | I | Interface Mode Select |
| 30 | A | P | Power for LED Backlight Anode |
| 31 | K | P | Power for LED Backlight Cathode |
3.4 Optical Specifications
Optical characteristics are measured at θx = θy = 0.
| Item | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Response Time (Tr+Tf) | Tr+Tf | - | 30 | 35 | ms |
| Contrast Ratio | CR | 900 | 1100 | - | - |
| Transmittance | T% | 3.06 | 3.6 | - | % |
| Color Chromaticity (White) - CIE1931 | Wx, Wy | - | 0.324, 0.347 | - | - |
| Viewing Angle (CR > 10) | θT, θB, θL, θR | - | 85 (All Directions) | - | Deg. |
3.5 Backlight Circuit
The backlight uses a White LED (2 LEDs). The driving condition is If=40mA, Vf=3.0V~3.4V.
4. Application Guidelines & Critical Notes
When integrating the LSI0128HG003A module, engineers must adhere to the specific guidelines outlined in the specification to ensure optimal performance and reliability.
- Power Supply: The module requires a main supply voltage (VCC) of 2.5V to 3.3V and an IO supply (IOVCC) of 1.65V to 3.3V. Both can be connected to the same 2.8V or 3.3V rail for simplicity.
- 16-bit 8080 Parallel Interface: This is a high-speed parallel interface using 16 data lines (DB0-DB15), along with control signals CS (Chip Select), RS (Data/Command), WR (Write), and RD (Read). The interface mode is selected by the IM0, IM1, and IM2 pins. Ensure the host MCU is configured correctly to use the 16-bit 8080 protocol.
- Backlight Driver (External): The backlight requires an external constant current driver set to 40mA (Typ). The forward voltage of the 2-chip LED is approximately 3.0V to 3.4V. The LED Anode (A) and Cathode (K) pins are brought out separately for easy connection.
- Mechanical Integration: The module outline dimensions are 35.2(H) x 37.24(V) x 0.5(T) mm. The active area is a circle with a diameter of 32.4mm. The unmarked tolerance is ±0.3mm. The PI+FPC total thickness is 0.2±0.03mm.
- Handling Precautions: The module uses a glass LCD panel and CMOS LSI. Handle with care to avoid breakage and protect against static electricity. Do not expose to condensation, strong mechanical shock, or fixed patterns for extended periods to prevent image sticking.
- RoHS Compliance: This module is designed to comply with RoHS directives.
5. Conclusion & Design-In Support
The LSI0128HG003A from Lesson Smart Display Technology is a compact, high-performance 1.28-inch TFT-LCD module. Its combination of a 16-bit 8080 parallel interface, Integrated GC9A01A driver, and IPS viewing angles makes it a powerful choice for applications requiring fast display updates and wide viewing angles.
For design-in support, it is strongly recommended to:
- Obtain and review the full Product Specification (Revision 1.0) for the complete set of electrical parameters, interface timing diagrams, and the mechanical outline drawing.
- Design the power supply to provide a single 2.8V or 3.3V rail, and design a constant current backlight driver (40mA at ~3.2V).
- Develop firmware using the GC9A01A driver IC, paying careful attention to the 16-bit 8080 interface timing requirements (Write Cycle: 66ns min).
- Contact the manufacturer for evaluation kits, sample requests, and technical support during the design-in phase.
This module is engineered to deliver reliable and vibrant display performance for demanding embedded systems.
